Carrier 42KZL012NS Owner's Manual page 12

Error Codes
Number
In-outdoor unit communication
1
checking channel is abnormal
2 Room temperature sensor
checking channel is abnormal
3 Evaporator sensor malfunction
4 Condenser sensor malfunction
5 Water pump temperature sensor
6 Outdoor malfunction
7 EEPROM malfunction
Water level alarm malfunction
8
9 DC motor speed out of control
10 Outdoor unit low pressure
malfunction
Refrigerant leak detection system
11
malfunction
 Page 12 
Operation
Cause
indicator
Quick-flash
Quick-flash
Quick-flash Quick-flash
Quick-flash Quick-flash
Quick-flash Quick-flash
Quick-flash
Timer
PRE-DEF
indicator
indicator
Quick-flash
Quick-flash
Quick-flash
Quick-flash
Quick-flash
Quick-flash
MANUAL
Error
Alarm
Code
indicator
E 1
E2
E3
E4
E5
Quick-flash
E6
Quick-flash
E7
E8
Quick-flash
Quick-flash
EC
Quick-flash